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Protein

Proteasome subunit beta type-1

Gene

PSMB1

Organism
Homo sapiens (Human)
Status
Reviewed-Annotation score: Annotation score: 5 out of 5-Experimental evidence at protein leveli

Functioni

The proteasome is a multicatalytic proteinase complex which is characterized by its ability to cleave peptides with Arg, Phe, Tyr, Leu, and Glu adjacent to the leaving group at neutral or slightly basic pH. The proteasome has an ATP-dependent proteolytic activity.

Catalytic activityi

Cleavage of peptide bonds with very broad specificity.

GO - Molecular functioni

GO - Biological processi

Complete GO annotation...

Keywords - Molecular functioni

Hydrolase, Protease, Threonine protease

Keywords - Biological processi

Host-virus interaction

Enzyme and pathway databases

BioCyciZFISH:HS00227-MONOMER.
ReactomeiR-HSA-1169091. Activation of NF-kappaB in B cells.
R-HSA-1234176. Oxygen-dependent proline hydroxylation of Hypoxia-inducible Factor Alpha.
R-HSA-1236974. ER-Phagosome pathway.
R-HSA-1236978. Cross-presentation of soluble exogenous antigens (endosomes).
R-HSA-174084. Autodegradation of Cdh1 by Cdh1:APC/C.
R-HSA-174113. SCF-beta-TrCP mediated degradation of Emi1.
R-HSA-174154. APC/C:Cdc20 mediated degradation of Securin.
R-HSA-174178. APC/C:Cdh1 mediated degradation of Cdc20 and other APC/C:Cdh1 targeted proteins in late mitosis/early G1.
R-HSA-174184. Cdc20:Phospho-APC/C mediated degradation of Cyclin A.
R-HSA-180534. Vpu mediated degradation of CD4.
R-HSA-180585. Vif-mediated degradation of APOBEC3G.
R-HSA-187577. SCF(Skp2)-mediated degradation of p27/p21.
R-HSA-195253. Degradation of beta-catenin by the destruction complex.
R-HSA-202424. Downstream TCR signaling.
R-HSA-211733. Regulation of activated PAK-2p34 by proteasome mediated degradation.
R-HSA-2467813. Separation of Sister Chromatids.
R-HSA-2871837. FCERI mediated NF-kB activation.
R-HSA-349425. Autodegradation of the E3 ubiquitin ligase COP1.
R-HSA-350562. Regulation of ornithine decarboxylase (ODC).
R-HSA-382556. ABC-family proteins mediated transport.
R-HSA-450408. AUF1 (hnRNP D0) binds and destabilizes mRNA.
R-HSA-4608870. Asymmetric localization of PCP proteins.
R-HSA-4641257. Degradation of AXIN.
R-HSA-4641258. Degradation of DVL.
R-HSA-5358346. Hedgehog ligand biogenesis.
R-HSA-5362768. Hh mutants that don't undergo autocatalytic processing are degraded by ERAD.
R-HSA-5607761. Dectin-1 mediated noncanonical NF-kB signaling.
R-HSA-5607764. CLEC7A (Dectin-1) signaling.
R-HSA-5610780. Degradation of GLI1 by the proteasome.
R-HSA-5610783. Degradation of GLI2 by the proteasome.
R-HSA-5610785. GLI3 is processed to GLI3R by the proteasome.
R-HSA-5632684. Hedgehog 'on' state.
R-HSA-5658442. Regulation of RAS by GAPs.
R-HSA-5668541. TNFR2 non-canonical NF-kB pathway.
R-HSA-5676590. NIK-->noncanonical NF-kB signaling.
R-HSA-5678895. Defective CFTR causes cystic fibrosis.
R-HSA-5687128. MAPK6/MAPK4 signaling.
R-HSA-5689603. UCH proteinases.
R-HSA-5689880. Ub-specific processing proteases.
R-HSA-6798695. Neutrophil degranulation.
R-HSA-68827. CDT1 association with the CDC6:ORC:origin complex.
R-HSA-68949. Orc1 removal from chromatin.
R-HSA-69017. CDK-mediated phosphorylation and removal of Cdc6.
R-HSA-69229. Ubiquitin-dependent degradation of Cyclin D1.
R-HSA-69481. G2/M Checkpoints.
R-HSA-69601. Ubiquitin Mediated Degradation of Phosphorylated Cdc25A.
R-HSA-8852276. The role of GTSE1 in G2/M progression after G2 checkpoint.
R-HSA-8854050. FBXL7 down-regulates AURKA during mitotic entry and in early mitosis.
R-HSA-983168. Antigen processing: Ubiquitination & Proteasome degradation.

Protein family/group databases

MEROPSiT01.986.

Names & Taxonomyi

Protein namesi
Recommended name:
Proteasome subunit beta type-1 (EC:3.4.25.1)
Alternative name(s):
Macropain subunit C5
Multicatalytic endopeptidase complex subunit C5
Proteasome component C5
Proteasome gamma chain
Gene namesi
Name:PSMB1
Synonyms:PSC5
OrganismiHomo sapiens (Human)
Taxonomic identifieri9606 [NCBI]
Taxonomic lineageiEukaryotaMetazoaChordataCraniataVertebrataEuteleostomiMammaliaEutheriaEuarchontogliresPrimatesHaplorrhiniCatarrhiniHominidaeHomo
Proteomesi
  • UP000005640 Componenti: Chromosome 6

Organism-specific databases

HGNCiHGNC:9537. PSMB1.

Subcellular locationi

GO - Cellular componenti

  • cytosol Source: Reactome
  • extracellular exosome Source: UniProtKB
  • nucleoplasm Source: Reactome
  • nucleus Source: UniProtKB
  • proteasome complex Source: UniProtKB
  • proteasome core complex Source: UniProtKB
Complete GO annotation...

Keywords - Cellular componenti

Cytoplasm, Nucleus, Proteasome

Pathology & Biotechi

Organism-specific databases

DisGeNETi5689.
OpenTargetsiENSG00000008018.
PharmGKBiPA33882.

Chemistry databases

ChEMBLiCHEMBL4208.
DrugBankiDB00188. Bortezomib.
DB08889. Carfilzomib.
GuidetoPHARMACOLOGYi2404.

Polymorphism and mutation databases

BioMutaiPSMB1.
DMDMi130853.

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
PropeptideiPRO_00002596231 – 281 PublicationAdd BLAST28
ChainiPRO_000014803029 – 241Proteasome subunit beta type-1Add BLAST213

Amino acid modifications

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Modified residuei1N-acetylmethionineCombined sources1
Glycosylationi58O-linked (GlcNAc)By similarity1
Modified residuei62PhosphoserineCombined sources1
Modified residuei68PhosphoserineCombined sources1
Modified residuei150PhosphotyrosineBy similarity1
Modified residuei162PhosphoserineCombined sources1
Modified residuei204N6-acetyllysineCombined sources1
Glycosylationi209O-linked (GlcNAc)By similarity1

Keywords - PTMi

Acetylation, Glycoprotein, Phosphoprotein

Proteomic databases

EPDiP20618.
MaxQBiP20618.
PaxDbiP20618.
PeptideAtlasiP20618.
PRIDEiP20618.
TopDownProteomicsiP20618.

2D gel databases

REPRODUCTION-2DPAGEIPI00025019.
UCD-2DPAGEP20618.

PTM databases

iPTMnetiP20618.
PhosphoSitePlusiP20618.
SwissPalmiP20618.

Expressioni

Gene expression databases

BgeeiENSG00000008018.
CleanExiHS_PSMB1.
ExpressionAtlasiP20618. baseline and differential.
GenevisibleiP20618. HS.

Organism-specific databases

HPAiCAB033911.
HPA029635.
HPA029637.

Interactioni

Subunit structurei

The 26S proteasome consists of a 20S proteasome core and two 19S regulatory subunits. The 20S proteasome core is composed of 28 subunits that are arranged in four stacked rings, resulting in a barrel-shaped structure. The two end rings are each formed by seven alpha subunits, and the two central rings are each formed by seven beta subunits. The catalytic chamber with the active sites is on the inside of the barrel. Interacts with SERPINB2. Interacts with HIV-1 TAT protein.2 Publications

Binary interactionsi

WithEntry#Exp.IntActNotes
KIFC3Q9BVG83EBI-372273,EBI-2125614
KRT13A1A4E93EBI-372273,EBI-10171552
KRT15P190125EBI-372273,EBI-739566
MAPRE3Q9UPY83EBI-372273,EBI-726739
PSMB5P280743EBI-372273,EBI-357828
PSMB7Q994368EBI-372273,EBI-603319
TRAF1Q130775EBI-372273,EBI-359224
TRIM27P143735EBI-372273,EBI-719493

Protein-protein interaction databases

BioGridi111662. 127 interactors.
DIPiDIP-31193N.
IntActiP20618. 50 interactors.
MINTiMINT-3009312.
STRINGi9606.ENSP00000262193.

Chemistry databases

BindingDBiP20618.

Structurei

Secondary structure

1241
Legend: HelixTurnBeta strandPDB Structure known for this area
Show more details
Feature keyPosition(s)DescriptionActionsGraphical viewLength
Beta strandi39 – 44Combined sources6
Beta strandi49 – 54Combined sources6
Beta strandi57 – 59Combined sources3
Beta strandi62 – 66Combined sources5
Beta strandi71 – 75Combined sources5
Beta strandi78 – 84Combined sources7
Helixi86 – 107Combined sources22
Helixi113 – 126Combined sources14
Turni127 – 129Combined sources3
Beta strandi134 – 141Combined sources8
Beta strandi147 – 152Combined sources6
Beta strandi158 – 167Combined sources10
Helixi170 – 180Combined sources11
Helixi196 – 213Combined sources18
Beta strandi214 – 217Combined sources4
Beta strandi219 – 227Combined sources9
Beta strandi230 – 237Combined sources8

3D structure databases

Select the link destinations:
PDBei
RCSB PDBi
PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
4R3OX-ray2.601/M29-241[»]
4R67X-ray2.891/M/a/o29-241[»]
5A0Qelectron microscopy3.50M/a29-241[»]
5GJQelectron microscopy4.50f/t1-241[»]
5GJRelectron microscopy3.50f/t1-241[»]
5L4Gelectron microscopy4.021/U1-241[»]
5LE5X-ray1.80L/Z29-241[»]
5LEXX-ray2.20L/Z29-241[»]
5LEYX-ray1.90L/Z29-241[»]
5LEZX-ray2.19L/Z29-241[»]
5LF0X-ray2.41L/Z29-241[»]
5LF1X-ray2.00L/Z29-241[»]
5LF3X-ray2.10L/Z29-241[»]
5LF4X-ray1.99L/Z29-241[»]
5LF6X-ray2.07L/Z29-241[»]
5LF7X-ray2.00L/Z29-241[»]
5T0Celectron microscopy3.80AS/BS2-241[»]
5T0Gelectron microscopy4.40S2-241[»]
5T0Helectron microscopy6.80S2-241[»]
5T0Ielectron microscopy8.00S2-241[»]
5T0Jelectron microscopy8.00S2-241[»]
ProteinModelPortaliP20618.
SMRiP20618.
ModBaseiSearch...
MobiDBiSearch...

Family & Domainsi

Sequence similaritiesi

Belongs to the peptidase T1B family.PROSITE-ProRule annotation

Phylogenomic databases

eggNOGiKOG0179. Eukaryota.
COG0638. LUCA.
GeneTreeiENSGT00550000075035.
HOGENOMiHOG000091081.
HOVERGENiHBG000961.
InParanoidiP20618.
KOiK02732.
OMAiQNPLMNG.
OrthoDBiEOG091G0FUK.
PhylomeDBiP20618.
TreeFamiTF106218.

Family and domain databases

Gene3Di3.60.20.10. 1 hit.
InterProiIPR029055. Ntn_hydrolases_N.
IPR016050. Proteasome_bsu_CS.
IPR001353. Proteasome_sua/b.
IPR023333. Proteasome_suB-type.
[Graphical view]
PfamiPF00227. Proteasome. 1 hit.
[Graphical view]
SUPFAMiSSF56235. SSF56235. 1 hit.
PROSITEiPS00854. PROTEASOME_BETA_1. 1 hit.
PS51476. PROTEASOME_BETA_2. 1 hit.
[Graphical view]

Sequencei

Sequence statusi: Complete.

Sequence processingi: The displayed sequence is further processed into a mature form.

P20618-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MLSSTAMYSA PGRDLGMEPH RAAGPLQLRF SPYVFNGGTI LAIAGEDFAI
60 70 80 90 100
VASDTRLSEG FSIHTRDSPK CYKLTDKTVI GCSGFHGDCL TLTKIIEARL
110 120 130 140 150
KMYKHSNNKA MTTGAIAAML STILYSRRFF PYYVYNIIGG LDEEGKGAVY
160 170 180 190 200
SFDPVGSYQR DSFKAGGSAS AMLQPLLDNQ VGFKNMQNVE HVPLSLDRAM
210 220 230 240
RLVKDVFISA AERDVYTGDA LRICIVTKEG IREETVSLRK D
Length:241
Mass (Da):26,489
Last modified:May 1, 1992 - v2
Checksum:iAE8FC42799F39157
GO

Natural variant

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Natural variantiVAR_05154711P → A.1 PublicationCorresponds to variant rs12717dbSNPEnsembl.1
Natural variantiVAR_051548208I → N.Corresponds to variant rs10541dbSNPEnsembl.1

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
D00761 mRNA. Translation: BAA00658.1.
BT019720 mRNA. Translation: AAV38525.1.
AB451312 mRNA. Translation: BAG70126.1.
AB451442 mRNA. Translation: BAG70256.1.
AL031259 Genomic DNA. Translation: CAA20287.1.
BC000508 mRNA. Translation: AAH00508.1.
BC020807 mRNA. Translation: AAH20807.1.
CCDSiCCDS34577.1.
PIRiS15973. SNHUC5.
RefSeqiNP_002784.1. NM_002793.3.
UniGeneiHs.352768.

Genome annotation databases

EnsembliENST00000262193; ENSP00000262193; ENSG00000008018.
GeneIDi5689.
KEGGihsa:5689.
UCSCiuc011ehe.3. human.

Keywords - Coding sequence diversityi

Polymorphism

Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
D00761 mRNA. Translation: BAA00658.1.
BT019720 mRNA. Translation: AAV38525.1.
AB451312 mRNA. Translation: BAG70126.1.
AB451442 mRNA. Translation: BAG70256.1.
AL031259 Genomic DNA. Translation: CAA20287.1.
BC000508 mRNA. Translation: AAH00508.1.
BC020807 mRNA. Translation: AAH20807.1.
CCDSiCCDS34577.1.
PIRiS15973. SNHUC5.
RefSeqiNP_002784.1. NM_002793.3.
UniGeneiHs.352768.

3D structure databases

Select the link destinations:
PDBei
RCSB PDBi
PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
4R3OX-ray2.601/M29-241[»]
4R67X-ray2.891/M/a/o29-241[»]
5A0Qelectron microscopy3.50M/a29-241[»]
5GJQelectron microscopy4.50f/t1-241[»]
5GJRelectron microscopy3.50f/t1-241[»]
5L4Gelectron microscopy4.021/U1-241[»]
5LE5X-ray1.80L/Z29-241[»]
5LEXX-ray2.20L/Z29-241[»]
5LEYX-ray1.90L/Z29-241[»]
5LEZX-ray2.19L/Z29-241[»]
5LF0X-ray2.41L/Z29-241[»]
5LF1X-ray2.00L/Z29-241[»]
5LF3X-ray2.10L/Z29-241[»]
5LF4X-ray1.99L/Z29-241[»]
5LF6X-ray2.07L/Z29-241[»]
5LF7X-ray2.00L/Z29-241[»]
5T0Celectron microscopy3.80AS/BS2-241[»]
5T0Gelectron microscopy4.40S2-241[»]
5T0Helectron microscopy6.80S2-241[»]
5T0Ielectron microscopy8.00S2-241[»]
5T0Jelectron microscopy8.00S2-241[»]
ProteinModelPortaliP20618.
SMRiP20618.
ModBaseiSearch...
MobiDBiSearch...

Protein-protein interaction databases

BioGridi111662. 127 interactors.
DIPiDIP-31193N.
IntActiP20618. 50 interactors.
MINTiMINT-3009312.
STRINGi9606.ENSP00000262193.

Chemistry databases

BindingDBiP20618.
ChEMBLiCHEMBL4208.
DrugBankiDB00188. Bortezomib.
DB08889. Carfilzomib.
GuidetoPHARMACOLOGYi2404.

Protein family/group databases

MEROPSiT01.986.

PTM databases

iPTMnetiP20618.
PhosphoSitePlusiP20618.
SwissPalmiP20618.

Polymorphism and mutation databases

BioMutaiPSMB1.
DMDMi130853.

2D gel databases

REPRODUCTION-2DPAGEIPI00025019.
UCD-2DPAGEP20618.

Proteomic databases

EPDiP20618.
MaxQBiP20618.
PaxDbiP20618.
PeptideAtlasiP20618.
PRIDEiP20618.
TopDownProteomicsiP20618.

Protocols and materials databases

DNASUi5689.
Structural Biology KnowledgebaseSearch...

Genome annotation databases

EnsembliENST00000262193; ENSP00000262193; ENSG00000008018.
GeneIDi5689.
KEGGihsa:5689.
UCSCiuc011ehe.3. human.

Organism-specific databases

CTDi5689.
DisGeNETi5689.
GeneCardsiPSMB1.
HGNCiHGNC:9537. PSMB1.
HPAiCAB033911.
HPA029635.
HPA029637.
MIMi602017. gene.
neXtProtiNX_P20618.
OpenTargetsiENSG00000008018.
PharmGKBiPA33882.
GenAtlasiSearch...

Phylogenomic databases

eggNOGiKOG0179. Eukaryota.
COG0638. LUCA.
GeneTreeiENSGT00550000075035.
HOGENOMiHOG000091081.
HOVERGENiHBG000961.
InParanoidiP20618.
KOiK02732.
OMAiQNPLMNG.
OrthoDBiEOG091G0FUK.
PhylomeDBiP20618.
TreeFamiTF106218.

Enzyme and pathway databases

BioCyciZFISH:HS00227-MONOMER.
ReactomeiR-HSA-1169091. Activation of NF-kappaB in B cells.
R-HSA-1234176. Oxygen-dependent proline hydroxylation of Hypoxia-inducible Factor Alpha.
R-HSA-1236974. ER-Phagosome pathway.
R-HSA-1236978. Cross-presentation of soluble exogenous antigens (endosomes).
R-HSA-174084. Autodegradation of Cdh1 by Cdh1:APC/C.
R-HSA-174113. SCF-beta-TrCP mediated degradation of Emi1.
R-HSA-174154. APC/C:Cdc20 mediated degradation of Securin.
R-HSA-174178. APC/C:Cdh1 mediated degradation of Cdc20 and other APC/C:Cdh1 targeted proteins in late mitosis/early G1.
R-HSA-174184. Cdc20:Phospho-APC/C mediated degradation of Cyclin A.
R-HSA-180534. Vpu mediated degradation of CD4.
R-HSA-180585. Vif-mediated degradation of APOBEC3G.
R-HSA-187577. SCF(Skp2)-mediated degradation of p27/p21.
R-HSA-195253. Degradation of beta-catenin by the destruction complex.
R-HSA-202424. Downstream TCR signaling.
R-HSA-211733. Regulation of activated PAK-2p34 by proteasome mediated degradation.
R-HSA-2467813. Separation of Sister Chromatids.
R-HSA-2871837. FCERI mediated NF-kB activation.
R-HSA-349425. Autodegradation of the E3 ubiquitin ligase COP1.
R-HSA-350562. Regulation of ornithine decarboxylase (ODC).
R-HSA-382556. ABC-family proteins mediated transport.
R-HSA-450408. AUF1 (hnRNP D0) binds and destabilizes mRNA.
R-HSA-4608870. Asymmetric localization of PCP proteins.
R-HSA-4641257. Degradation of AXIN.
R-HSA-4641258. Degradation of DVL.
R-HSA-5358346. Hedgehog ligand biogenesis.
R-HSA-5362768. Hh mutants that don't undergo autocatalytic processing are degraded by ERAD.
R-HSA-5607761. Dectin-1 mediated noncanonical NF-kB signaling.
R-HSA-5607764. CLEC7A (Dectin-1) signaling.
R-HSA-5610780. Degradation of GLI1 by the proteasome.
R-HSA-5610783. Degradation of GLI2 by the proteasome.
R-HSA-5610785. GLI3 is processed to GLI3R by the proteasome.
R-HSA-5632684. Hedgehog 'on' state.
R-HSA-5658442. Regulation of RAS by GAPs.
R-HSA-5668541. TNFR2 non-canonical NF-kB pathway.
R-HSA-5676590. NIK-->noncanonical NF-kB signaling.
R-HSA-5678895. Defective CFTR causes cystic fibrosis.
R-HSA-5687128. MAPK6/MAPK4 signaling.
R-HSA-5689603. UCH proteinases.
R-HSA-5689880. Ub-specific processing proteases.
R-HSA-6798695. Neutrophil degranulation.
R-HSA-68827. CDT1 association with the CDC6:ORC:origin complex.
R-HSA-68949. Orc1 removal from chromatin.
R-HSA-69017. CDK-mediated phosphorylation and removal of Cdc6.
R-HSA-69229. Ubiquitin-dependent degradation of Cyclin D1.
R-HSA-69481. G2/M Checkpoints.
R-HSA-69601. Ubiquitin Mediated Degradation of Phosphorylated Cdc25A.
R-HSA-8852276. The role of GTSE1 in G2/M progression after G2 checkpoint.
R-HSA-8854050. FBXL7 down-regulates AURKA during mitotic entry and in early mitosis.
R-HSA-983168. Antigen processing: Ubiquitination & Proteasome degradation.

Miscellaneous databases

ChiTaRSiPSMB1. human.
GeneWikiiPSMB1.
GenomeRNAii5689.
PROiP20618.
SOURCEiSearch...

Gene expression databases

BgeeiENSG00000008018.
CleanExiHS_PSMB1.
ExpressionAtlasiP20618. baseline and differential.
GenevisibleiP20618. HS.

Family and domain databases

Gene3Di3.60.20.10. 1 hit.
InterProiIPR029055. Ntn_hydrolases_N.
IPR016050. Proteasome_bsu_CS.
IPR001353. Proteasome_sua/b.
IPR023333. Proteasome_suB-type.
[Graphical view]
PfamiPF00227. Proteasome. 1 hit.
[Graphical view]
SUPFAMiSSF56235. SSF56235. 1 hit.
PROSITEiPS00854. PROTEASOME_BETA_1. 1 hit.
PS51476. PROTEASOME_BETA_2. 1 hit.
[Graphical view]
ProtoNetiSearch...

Entry informationi

Entry nameiPSB1_HUMAN
AccessioniPrimary (citable) accession number: P20618
Secondary accession number(s): B5BU76, Q9BWA8
Entry historyi
Integrated into UniProtKB/Swiss-Prot: February 1, 1991
Last sequence update: May 1, 1992
Last modified: November 30, 2016
This is version 184 of the entry and version 2 of the sequence. [Complete history]
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programChordata Protein Annotation Program
DisclaimerAny medical or genetic information present in this entry is provided for research, educational and informational purposes only. It is not in any way intended to be used as a substitute for professional medical advice, diagnosis, treatment or care.

Miscellaneousi

Keywords - Technical termi

3D-structure, Complete proteome, Direct protein sequencing, Reference proteome

Documents

  1. Human chromosome 6
    Human chromosome 6: entries, gene names and cross-references to MIM
  2. Human entries with polymorphisms or disease mutations
    List of human entries with polymorphisms or disease mutations
  3. Human polymorphisms and disease mutations
    Index of human polymorphisms and disease mutations
  4. MIM cross-references
    Online Mendelian Inheritance in Man (MIM) cross-references in UniProtKB/Swiss-Prot
  5. PDB cross-references
    Index of Protein Data Bank (PDB) cross-references
  6. Peptidase families
    Classification of peptidase families and list of entries
  7. SIMILARITY comments
    Index of protein domains and families

Similar proteinsi

Links to similar proteins from the UniProt Reference Clusters (UniRef) at 100%, 90% and 50% sequence identity:
100%UniRef100 combines identical sequences and sub-fragments with 11 or more residues from any organism into one UniRef entry.
90%UniRef90 is built by clustering UniRef100 sequences that have at least 90% sequence identity to, and 80% overlap with, the longest sequence (a.k.a seed sequence).
50%UniRef50 is built by clustering UniRef90 seed sequences that have at least 50% sequence identity to, and 80% overlap with, the longest sequence in the cluster.